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USB-9472 supports buffered DO?
Matthew_Kelton
Active Participant
10-15-2007 01:32 PM
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I have a customer who needs to generate a 24V trigger. The trigger at worst will be comprised of 4 bursts of 5ms, seperated by a 300ms delay. It looks like I can do it with a USB-6251 TTL line and buffered generation, but I was curious if the USB-9472 would do it? The specs don't say either way.
Thanks,
Matthew
Thanks,
Matthew
Neal M
NI Employee (retired)
10-16-2007 11:48 AM
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Hello Matthew,
It appears there may be some confusion about our M Series DAQ. The USB-6251 can only do standard TTL logic, which is 0-5V. In order to do the 24V digital logic, you will need a high voltage Digital Output device. This narrows down the choices quite a bit. By looking at our USB Digital I/O Product Selection Guide, it appears that to attain the output voltages you require, the 9472 is the way to go.
If you want to do a finite pulse train. If this is the case, then you will need 2 counters to accomplish this. I believe that if you use the cDAQ 9172 Chassis, there are two counters available from slots 5 or 6. If the timing for the trigger is not essential, then you could just do this programatically instead of using the counters. One thing to note about this setup, you will need a pulldown resistor for the "low" state. Here is a Knowledgebase about that.
I hope this helps.
It appears there may be some confusion about our M Series DAQ. The USB-6251 can only do standard TTL logic, which is 0-5V. In order to do the 24V digital logic, you will need a high voltage Digital Output device. This narrows down the choices quite a bit. By looking at our USB Digital I/O Product Selection Guide, it appears that to attain the output voltages you require, the 9472 is the way to go.
If you want to do a finite pulse train. If this is the case, then you will need 2 counters to accomplish this. I believe that if you use the cDAQ 9172 Chassis, there are two counters available from slots 5 or 6. If the timing for the trigger is not essential, then you could just do this programatically instead of using the counters. One thing to note about this setup, you will need a pulldown resistor for the "low" state. Here is a Knowledgebase about that.
I hope this helps.
Neal M.
Applications Engineering National Instruments www.ni.com/support
Applications Engineering National Instruments www.ni.com/support
KyleBryson
Member
10-16-2007 01:31 PM
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Hi Matthew,
You can probably achieve your desired output using buffered generation or counters, both of which are possible (at TTL levels) on a USB-6251. Both are also possible using an NI 9472 in a CompactDAQ chassis. However, the USB-9472 single-slot device only supports On Demand output, not buffered generation or counters.
Regards,
Kyle
You can probably achieve your desired output using buffered generation or counters, both of which are possible (at TTL levels) on a USB-6251. Both are also possible using an NI 9472 in a CompactDAQ chassis. However, the USB-9472 single-slot device only supports On Demand output, not buffered generation or counters.
Regards,
Kyle
